Cable Tray Hanger Specification Table
Cable tray hangers should be selected based on tray type, load class, support span, and environmental conditions to ensure safe and reliable cable support.
Key Considerations for Hanger Selection
1. Load Class and Tray Type: Cable trays are classified by load-carrying capacity, which determines the hanger spacing and type. Ladder trays, ventilated trays, and solid-bottom trays have different mechanical requirements. The load class is typically defined as light, medium, or heavy, affecting the choice of hanger and support span . 2. Support Span: The distance between hangers depends on tray width, material, and load. Wider trays or heavier loads require shorter spans. Typical spans for steel ladder trays range from 1.5 m to 3 m, while lighter aluminum or mesh trays may allow longer spans . 3. Material and Corrosion Protection: Hangers should match the tray material and environmental conditions. Common materials include galvanized steel, stainless steel (AISI 316L), and aluminum. For corrosive environments, stainless steel or hot-dip galvanized hangers are recommended . 4. Mounting Method: Hangers can be wall-mounted, ceiling-suspended, or stand-off brackets. Fully slotted brackets allow on-site adjustment and secure attachment to structural elements . Ceiling supports often use threaded rods with clamps, while wall brackets may use anchor bolts.
Example Cable Tray Hanger Selection Table
| Tray Type | Load Class | Tray Width | Max Support Span | Recommended Hanger Type | Material |
|---|---|---|---|---|---|
| Ladder Tray | Light | 100–300 mm | 2.5 m | Ceiling rod with clamp | Galvanized steel |
| Ladder Tray | Medium | 300–600 mm | 2.0 m | Stand-off wall bracket | Stainless steel |
| Ladder Tray | Heavy | 600–900 mm | 1.5 m | Ceiling rod with cross support | Stainless steel |
| Solid Bottom Tray | Light | 100–300 mm | 2.0 m | Wall bracket | Galvanized steel |
| Solid Bottom Tray | Medium | 300–600 mm | 1.5 m | Stand-off bracket | Stainless steel |
| Mesh Tray | Light | 100–400 mm | 3.0 m | Ceiling rod with clamp | Aluminum |
Additional Guidelines
- Adjustability: Use fully slotted hangers for flexibility during installation .
- Spacing Verification: Always verify hanger spacing against manufacturer load tables and local codes .
- Environmental Considerations: For outdoor or corrosive environments, select hangers with appropriate corrosion resistance.
- Compliance: Ensure hangers and trays comply with standards such as DIN EN 61537, UL, or NEMA as applicable . By following these specifications and using the selection table as a reference, engineers and installers can ensure mechanically sound, safe, and code-compliant cable tray installations.
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